JP2847024B2 - Forging die for stepped parts and method for forging stepped parts - Google Patents
Forging die for stepped parts and method for forging stepped partsInfo
- Publication number
- JP2847024B2 JP2847024B2 JP5316005A JP31600593A JP2847024B2 JP 2847024 B2 JP2847024 B2 JP 2847024B2 JP 5316005 A JP5316005 A JP 5316005A JP 31600593 A JP31600593 A JP 31600593A JP 2847024 B2 JP2847024 B2 JP 2847024B2
- Authority
- JP
- Japan
- Prior art keywords
- small
- diameter
- forging
- hole
- die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軸方向下段部、中段
部、上段部に夫々第１小径部、大径部、第２小径部を有
する軸状又は筒状の段付き部品を鍛造成形するための鍛
造金型及び鍛造方法に関し、特に、第１小径部と大径部
と第２小径部とを１工程で鍛造成形可能な段付き部品の
鍛造金型及び段付き部品の鍛造装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging process of an axial or cylindrical stepped part having a first small diameter portion, a large diameter portion, and a second small diameter portion at an axially lower, middle, and upper portion, respectively. In particular, the present invention relates to a forging die for a stepped component and a forging device for a stepped component capable of forging a first small diameter portion, a large diameter portion, and a second small diameter portion in one step. .
【０００２】[0002]
【従来の技術】従来、軸方向下段部，中段部，上段部に
夫々第１小径部、大径部、第２小径部が形成され、自動
車のミッションのアウトプットギヤ等として使用される
鍛造成形品である段付き部品として、例えば、図６に示
すものがある。この段付き部品１００は、軸方向下段部
の第１小径部１０１と、軸方向中段部の大径部１０２
と、軸方向上段部の第２小径部１０３とから形成され、
大径部１０２と第１，第２小径部１０１，１０３とは、
第１，第２小径部１０１，１０３から大径部に向けてし
だいに径が大きくなるように傾斜した第１，第２環状テ
ーパー部１０４，１０５を介して一体に連なっている。
この段付き部品１００は、鍛造成形後に、切削加工によ
り大径部に歯形を形成して完成品となる。2. Description of the Related Art Conventionally, a first small-diameter portion, a large-diameter portion, and a second small-diameter portion are formed at a lower portion, a middle portion, and an upper portion in an axial direction, respectively, and are forged formed for use as an output gear of a transmission of an automobile. FIG. 6 shows an example of a stepped component that is a product. The stepped component 100 includes a first small diameter portion 101 at a lower portion in the axial direction and a large diameter portion 102 at a middle portion in the axial direction.
And a second small-diameter portion 103 in the upper part in the axial direction,
The large diameter portion 102 and the first and second small diameter portions 101 and 103
The first and second small-diameter portions 101 and 103 are integrally connected via first and second annular tapered portions 104 and 105 that are inclined so as to gradually increase in diameter from the first and second small-diameter portions to the large-diameter portion.
The stepped component 100 is formed into a finished product by forming a tooth profile in a large diameter portion by cutting after forging.
【０００３】従来においては、このような段付き部品１
００は、図４に示す円筒状の鍛造素材１１０を用いて、
図５に示すように第１工程において、下段部の第１小径
部１０１と第１環状テーパー部１０４とをまず鍛造成形
し、次に図６に示すように第２工程において、上段部の
第２小径部１０３と第２環状テーパー部１０５とを鍛造
成形していた。Conventionally, such stepped parts 1
00 uses the cylindrical forging material 110 shown in FIG.
As shown in FIG. 5, in the first step, the first small diameter portion 101 and the first annular tapered portion 104 in the lower portion are first forged, and then, as shown in FIG. The two small diameter portions 103 and the second annular tapered portion 105 have been forged.
【０００４】[0004]
【発明が解決しようとする課題】前記のように、従来の
段付き部品１００の鍛造成形は、前記第１工程と第２工
程の２工程で行われていたために、工程数が多く、加工
コストが高くなるといった問題があった。この発明の目
的は、鍛造工程の工程数を削減して、１工程で鍛造成形
することができ、加工コストを低減できる段付き部品の
鍛造方法を提供することである。As described above, the conventional forging of the stepped part 100 is performed in two steps, the first step and the second step. There was a problem that it became high. SUMMARY OF THE INVENTION An object of the present invention is to provide a forging method for a stepped component that can reduce the number of forging steps, perform forging in one step, and reduce processing costs.
【０００５】[0005]
【課題を解決するための手段】請求項１の段付き部品の
鍛造金型は、軸方向下段部、中段部、上段部に夫々第１
小径部、大径部、第２小径部を有する軸状又は筒状の段
付き部品を鍛造成形する為の鍛造金型であって、前記鍛
造金型の下型ダイは、第１小径部を成形する為の第１小
径穴と、この第１小径穴の上端に連なり、上方へ向かっ
て大径化するように傾斜した環状のテーパー穴と、この
テーパー穴の上端に連なり大径部を成形する為の大径穴
とを備え、前記鍛造金型の上型パンチは、第２小径部を
成形する為の第２小径穴を有するとともに、前記大径穴
に摺接状に内嵌される筒状に形成され、その下端部に
は、上方に向かって小径化するように傾斜した環状のテ
ーパー面が形成されたことを特徴とするものである。According to a first aspect of the present invention, there is provided a forged die for a stepped part, wherein a first, a lower, a middle, and an upper step in the axial direction are respectively provided.
A forging die for forging an axial or cylindrical stepped part having a small diameter portion, a large diameter portion, and a second small diameter portion, wherein a lower die of the forging die has a first small diameter portion. A first small-diameter hole for molding, an annular tapered hole connected to the upper end of the first small-diameter hole and inclined to increase the diameter upward, and a large-diameter portion connected to the upper end of the tapered hole. The upper die punch of the forging die has a second small-diameter hole for forming a second small-diameter portion, and is slidably fitted in the large-diameter hole. It is formed in a cylindrical shape, and has a lower end formed with an annular tapered surface inclined so as to decrease in diameter upward.
【０００６】請求項２の段付き部品の鍛造方法は、軸方
向下段部、中段部、上段部に夫々第１小径部、大径部、
第２小径部を有する軸状又は筒状の段付き部品を１工程
で鍛造成形する方法であって、前記第１小径部を成形す
る為の第１小径穴と、この第１小径穴の上端に連なり、
上方へ向かって大径化するように傾斜した環状のテーパ
ー穴と、このテーパー穴の上端に連なり大径部を成形す
る為の大径穴とを備えた下型ダイと、前記第２小径部を
成形する為の第２小径穴を有するとともに、前記大径穴
に摺接状に内嵌される筒状に形成され、下端部には上方
に向かって小径化するように傾斜した環状のテーパー面
が形成された上型パンチとを用い、前記下型ダイのテー
パー穴の傾斜を介して第１小径穴への鍛造素材の流動を
促進するとともに、上型パンチのテーパー面を介して第
２小径穴への鍛造素材の流動を促進することを特徴とす
るものである。ここで、前記第１小径部の長さが第２小
径部の長さよりも大きいときには、前記テーパー穴の傾
斜角を前記テーパー面の傾斜角よりも大きく設定する
（請求項２に従属の請求項３）ことができる。According to a second aspect of the present invention, there is provided a method for forging a stepped component, wherein a first small diameter portion, a large diameter portion,
A method for forging a shaft-like or cylindrical stepped part having a second small-diameter portion in one step, comprising: a first small-diameter hole for molding the first small-diameter portion; and an upper end of the first small-diameter hole. ,
A lower die having an annular tapered hole inclined so as to increase in diameter upward, a large diameter hole connected to the upper end of the tapered hole to form a large diameter portion, and the second small diameter portion An annular taper having a second small-diameter hole for molding the same, and having a cylindrical shape which is fitted in the large-diameter hole so as to be slidably contacted, and a lower end portion of which is inclined so as to decrease in diameter upward. Using an upper punch having a surface formed thereon, the flow of the forging material to the first small-diameter hole is promoted through the inclination of the tapered hole of the lower die, and the second punch is formed through the tapered surface of the upper die. It is characterized by promoting the flow of the forging material into the small diameter hole. Here, when the length of the first small diameter portion is larger than the length of the second small diameter portion, the inclination angle of the tapered hole is set to be larger than the inclination angle of the tapered surface (claim dependent on claim 2). 3) You can.
【０００７】[0007]
【発明の作用及び効果】請求項１の段付き部品の鍛造金
型においては、鍛造素材を下型ダイの大径穴にセット
し、上型パンチを下型ダイに対して下降させ、上型パン
チの筒状部を下型ダイの大径穴に内嵌状に挿入し、この
筒状部で鍛造素材を押圧して成形する。この成形時に、
下型ダイのテーパー穴の傾斜面に鍛造素材の一部が案内
されて第１小径穴に流動する。また、この鍛造素材の一
部は、上型パンチの筒状部の下端部の環状テーパー面に
案内されて第２小径部に流動する。こうして、軸方向下
段部に第１小径部が、軸方向中段部に大径部が、軸方向
上段部に第２小径部が夫々形成された段付き部品が得ら
れる。このように、この段付き部品を１工程で鍛造成形
することができるので、鍛造成形の工程数を削減するこ
とができ、加工コストを低減することができる。In the forging die for stepped parts according to the first aspect, the forging material is set in the large-diameter hole of the lower die, and the upper die is lowered with respect to the lower die. The cylindrical portion of the punch is inserted into the large-diameter hole of the lower die so as to be fitted inside, and the forged material is pressed and molded by the cylindrical portion. During this molding,
A part of the forging material is guided on the inclined surface of the tapered hole of the lower die and flows into the first small diameter hole. A part of the forged material is guided by the annular tapered surface at the lower end of the cylindrical portion of the upper punch and flows to the second small diameter portion. In this way, a stepped component is obtained in which the first small diameter portion is formed in the lower part in the axial direction, the large diameter part is formed in the middle part in the axial direction, and the second small diameter part is formed in the upper part in the axial direction. As described above, since the stepped component can be forged in one process, the number of forging processes can be reduced, and the processing cost can be reduced.
【０００８】請求項２の段付き部品の鍛造方法において
は、上記鍛造金型と同様の作用・効果が得られる。更
に、下型ダイの傾斜状のテーパー穴によって、第１小径
穴への鍛造素材の流動が促進されるとともに、上型パン
チの傾斜状のテーパー面によって、第２小径穴への鍛造
素材の流動が促進されるので、欠肉のない成形品が得ら
れ、鍛造成形時における鍛造加工力が低減し、且つ金型
と鍛造素材との焼付きが生じず、金型寿命を向上させる
ことができる。In the method for forging a stepped part according to the second aspect, the same operation and effect as those of the forging die can be obtained. Further, the flow of the forging material into the first small-diameter hole is promoted by the inclined tapered hole of the lower die, and the flow of the forged material into the second small-diameter hole is promoted by the inclined tapered surface of the upper die punch. Is promoted, a molded product without underfill is obtained, the forging force during forging is reduced, and seizure between the mold and the forged material does not occur, and the life of the mold can be improved. .
【０００９】ここで、請求項３の鍛造方法においては、
テーパー穴の傾斜角をテーパー面の傾斜角よりも大きく
設定することによって、テーパー穴の傾斜面における鍛
造素材の流動を、テーパー面における鍛造素材の流動よ
りも大きく促進できるので、第１小径部の長さを第２小
径部の長さよりも大きくすることができる。また、第１
小径部の長さと第２小径部の長さに応じて、テーパー穴
の傾斜角と、テーパー面の傾斜角とを適切に設定するこ
とによって、欠肉のない成形品を１工程で鍛造成形する
ことができる。Here, in the forging method of claim 3,
By setting the inclination angle of the tapered hole larger than the inclination angle of the tapered surface, the flow of the forging material on the inclined surface of the tapered hole can be promoted more greatly than the flow of the forging material on the tapered surface. The length can be larger than the length of the second small diameter portion. Also, the first
By appropriately setting the inclination angle of the tapered hole and the inclination angle of the tapered surface according to the length of the small diameter portion and the length of the second small diameter portion, a molded product without underfill is forged in one step. be able to.
【００１０】[0010]
【実施例】以下、本発明の実施例について、図面を参照
しつつ説明する。本実施例は、自動車のミッションのア
ウトプットギヤ等の鍛造成形品である段付き部品を鍛造
成形する鍛造金型及び鍛造方法に本発明を適用した場合
の一例である。上記段付き部品１は、図３に示すよう
に、軸方向下段部の第１小径部２と、軸方向中段部の大
径部４と、軸方向上段部の第２小径部３とからなり、軸
心部に貫通孔７を有するものである。Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example in which the present invention is applied to a forging die and a forging method for forging a stepped part which is a forged product such as an output gear of an automobile transmission. As shown in FIG. 3, the stepped component 1 includes a first small diameter portion 2 at a lower portion in the axial direction, a large diameter portion 4 at a middle portion in the axial direction, and a second small diameter portion 3 at an upper portion in the axial direction. And a through hole 7 at the axial center.
【００１１】図１，図２に示すように、鍛造成形品であ
る段付き部品１を鍛造成形する鍛造装置１０の鍛造金型
１１の下型２０は、中心部に成形用穴２１を有するダイ
２２と、このダイ２２の中央貫通孔３０に挿入装着され
たマンドレル２４と、ダイ２２を下側セットプレート２
５に固定するダイホルダー２６とからなり、下側セット
プレート２５は鍛造装置１０のベース部材１２に固定さ
れている。ダイ２２の成形用穴２１は、第１小径穴２７
と、この第１小径穴２７の上端に連なり、上方へ向かっ
て大径化するように傾斜した環状のテーパー穴２８と、
このテーパー穴２８の上端に連なる大径穴２９とからな
る。As shown in FIGS. 1 and 2, a lower die 20 of a forging die 11 of a forging apparatus 10 for forging a stepped part 1 which is a forged product has a die 21 having a forming hole 21 at the center. 22, a mandrel 24 inserted and mounted in the central through hole 30 of the die 22, and the die 22
The lower set plate 25 is fixed to the base member 12 of the forging device 10. The forming hole 21 of the die 22 has a first small-diameter hole 27.
An annular tapered hole 28 connected to the upper end of the first small-diameter hole 27 and inclined so as to increase in diameter upward;
A large-diameter hole 29 is connected to the upper end of the tapered hole 28.
【００１２】また、鍛造装置１０の鍛造金型１１の上型
４０は、下端部に、上記大径穴２９に摺接状に内嵌され
る筒状部４１を有するパンチ４２と、このパンチ４２を
上側セットプレート４３に固定するパンチホルダー４４
とからなり、上側セットプレート４３は鍛造装置１０の
ラム部材１３に固定されている。マンドレル２４には、
ダイ２２の中央貫通孔３０（これは、第１小径穴２７と
同径でその下端に連なっている）に内嵌された下側の大
径部３１と、第１小径穴２７の底面を形成する段部３２
と、この段部３２を介して上部に連接された小径部３３
とが形成されている。The upper die 40 of the forging die 11 of the forging apparatus 10 has, at the lower end, a punch 42 having a cylindrical portion 41 that is slidably fitted in the large-diameter hole 29, and a punch 42. Punch holder 44 for fixing to the upper set plate 43
The upper set plate 43 is fixed to the ram member 13 of the forging device 10. The mandrel 24
A lower large-diameter portion 31 fitted inside a central through-hole 30 of the die 22 (which has the same diameter as the first small-diameter hole 27 and continues to the lower end thereof) and a bottom surface of the first small-diameter hole 27 are formed. Step 32
And a small diameter portion 33 connected to the upper portion through the step portion 32
Are formed.
【００１３】上記パンチ４２の筒状部４１には、内部に
第１小径穴２７とほぼ同径の第２小径穴４５が形成さ
れ、下端部には上方へ向かって小径化するように傾斜し
た環状のテーパー面４６が形成されている。この環状テ
ーパー面４６とテーパー穴２８とは、鍛造成形する段付
き部品１の形状に応じて、後述する製造方法で説明する
理由によって、その各傾斜角の大きさが予め適切に設定
される。即ち、環状のテーパー穴２８の傾斜角θ１は、
段付き部品１の第１小径部２の長さｈ１に応じた大きさ
に予め設定され、また、環状のテーパー面４６の傾斜角
θ２は、段付き部品１の第２小径部３の軸方向の長さｈ
２に応じた大きさに予め設定される。A second small-diameter hole 45 having substantially the same diameter as the first small-diameter hole 27 is formed in the cylindrical portion 41 of the punch 42, and a lower end thereof is inclined so as to decrease in diameter upward. An annular tapered surface 46 is formed. The size of each of the inclination angles of the annular tapered surface 46 and the tapered hole 28 is appropriately set in advance in accordance with the shape of the stepped component 1 to be forged and formed for the reason described later in the manufacturing method. That is, the inclination angle θ1 of the annular tapered hole 28 is
The tilt angle θ2 of the annular tapered surface 46 is set in advance in the axial direction of the second small diameter portion 3 of the stepped component 1 in accordance with the length h1 of the first small diameter portion 2 of the stepped component 1. Length h
2 is set in advance.
【００１４】本実施例では、第１小径部２の軸方向の長
さｈ１が第２小径部３の軸方向の長さｈ２より長いこと
から、環状のテーパー穴２８の傾斜角θ１は、環状のテ
ーパー面４６の傾斜角θ２よりも大きく形成され、段付
き部品１においては、大径部４から第１小径部２に連な
る第１環状テーパー部５が傾斜角θ１に成形され、ま
た、大径部４から第２小径部３に連なる第２環状テーパ
ー部６が傾斜角θ２に成形される。In this embodiment, since the axial length h1 of the first small diameter portion 2 is longer than the axial length h2 of the second small diameter portion 3, the inclination angle θ1 of the annular tapered hole 28 is Is formed to be larger than the inclination angle θ2 of the tapered surface 46, and in the stepped part 1, the first annular taper portion 5 continuing from the large diameter portion 4 to the first small diameter portion 2 is formed to have an inclination angle θ1. A second annular tapered portion 6 extending from the diameter portion 4 to the second small diameter portion 3 is formed at an inclination angle θ2.
【００１５】本実施例の場合、図３において、第１小径
部２の軸方向の長さｈ１が約３４ｍｍ、第２小径部３の
軸方向の長さｈ２が約２４ｍｍ、下側の第１環状テーパ
ー部５の傾斜角度θ１が３０°、上側の第２環状テーパ
ー部６の傾斜角度θ２が１５°になるように設定されて
いる。In the case of this embodiment, in FIG. 3, the axial length h1 of the first small-diameter portion 2 is approximately 34 mm, the axial length h2 of the second small-diameter portion 3 is approximately 24 mm, and the lower first The inclination angle θ1 of the annular taper portion 5 is set to 30 °, and the inclination angle θ2 of the upper second annular taper portion 6 is set to 15 °.
【００１６】次に、前記下型２０と上型４０とからなる
鍛造金型１１を用いて、段付き部品１を鍛造成形する鍛
造方法について説明する。最初に、筒状の鍛造素材８
に、マンドレル２４の小径部３３を貫通した状態で、ダ
イ２２の成形用穴２１の大径穴２９部分に鍛造素材８を
セットする。次に、ラム部材１３を下降させ、上側セッ
トプレート４３とパンチホルダー４４を介してパンチ４
２を下降させ、このパンチ４２の筒状部４１を、ダイ２
２の成形用穴２１の大径穴２９に内嵌状に挿入して、鍛
造素材８の外周部分に押し込ませる。Next, a description will be given of a forging method for forging the stepped part 1 using the forging die 11 composed of the lower die 20 and the upper die 40. First, the cylindrical forging material 8
Next, the forging material 8 is set in the large-diameter hole 29 of the molding hole 21 of the die 22 while penetrating the small-diameter portion 33 of the mandrel 24. Next, the ram member 13 is lowered, and the punch 4 is moved through the upper set plate 43 and the punch holder 44.
2 is lowered, and the cylindrical portion 41 of the punch 42 is
The forging material 8 is inserted into the large-diameter hole 29 of the second molding hole 21 so as to be pressed into the outer peripheral portion of the forged material 8.
【００１７】すると、図２に示すように、鍛造素材８が
パンチ４２の筒状部４１で押圧されると、鍛造素材８の
下部側部分が、成形用穴２１のテーパ穴２８の傾斜面で
案内されて流動が促進され、第１小径穴２７に流動して
第１小径部２が成形され、また、鍛造素材８の上部側部
分が、パンチ４２の筒状部４１の環状のテーパー面４６
で案内されて流動が促進され、第２小径穴４５に流動し
て軸方向上段部の第２小径部３が成形され、鍛造素材８
の軸方向中段部により、第１，第２小径部２，３と一体
的に大径部４が成形され、マンドレル２４の小径部３３
により、貫通孔７が成形される。Then, as shown in FIG. 2, when the forged material 8 is pressed by the cylindrical portion 41 of the punch 42, the lower side portion of the forged material 8 is inclined by the inclined surface of the tapered hole 28 of the forming hole 21. The first small-diameter portion 2 is formed by flowing to the first small-diameter hole 27 by being guided, and the upper side portion of the forging material 8 is formed by the annular tapered surface 46 of the cylindrical portion 41 of the punch 42.
And the flow is promoted, and flows into the second small-diameter hole 45 to form the second small-diameter portion 3 at the upper part in the axial direction.
The large-diameter portion 4 is formed integrally with the first and second small-diameter portions 2 and 3 by the middle portion in the axial direction, and the small-diameter portion 33 of the mandrel 24 is formed.
Thereby, the through hole 7 is formed.
【００１８】この鍛造成形の際に、上述したように、パ
ンチ４２の筒状部４１の下端面の環状テーパー面４６の
傾斜角よりも、ダイ２２の成形用穴２１のテーパー穴２
８の傾斜角の方が大きいので、第２小径穴４５への鍛造
素材８の流動の促進よりも第１小径穴２７への鍛造素材
８の流動の促進が大きくなる。これにより、鍛造成形さ
れた段付き部品１の第１小径部２の軸方向の長さｈ１
が、第２小径部３の軸方向の長さｈ２より、長く成形さ
れる。本実施例の場合には、ダイ２２の成形用穴２１の
テーパー穴２８による鍛造素材８の流動の促進がパンチ
４２の筒状部４１の下端面の環状テーパー面４６による
鍛造素材８の流動の促進より大きいので、段付き部品１
の第１小径部２の方が第２小径部３より長く形成され
る。At the time of the forging, as described above, the tapered hole 2 of the molding hole 21 of the die 22 is smaller than the inclination angle of the annular tapered surface 46 at the lower end surface of the cylindrical portion 41 of the punch 42.
Since the inclination angle of 8 is larger, the flow of the forging material 8 to the first small-diameter hole 27 is more promoted than the flow of the forging material 8 to the second small-diameter hole 45. Thereby, the axial length h1 of the first small diameter portion 2 of the forged stepped component 1 is obtained.
Is formed longer than the axial length h2 of the second small diameter portion 3. In the case of this embodiment, the flow of the forging material 8 is promoted by the tapered hole 28 of the forming hole 21 of the die 22 and the flow of the forging material 8 by the annular tapered surface 46 at the lower end surface of the cylindrical portion 41 of the punch 42. Stepped part 1 because it is larger than promotion
The first small diameter portion 2 is formed longer than the second small diameter portion 3.
【００１９】ここで、段付き部品１の第２小径部３の軸
方向の長さを第１小径部２の軸方向の長さより長く形成
したい場合には、ダイ２２の成形用穴２１のテーパー穴
２８の傾斜角の大きさより、パンチ４２の筒状部４１の
下端面の環状テーパー面４６の傾斜角の大きさを大きく
すればよい。尚、これら傾斜角は、実験等を介して第１
及び第２小径部２，３の長さとの関連において適切に設
定することが望ましい。このように、ダイ２２の成形用
穴２１のテーパー穴２８の傾斜角の大きさと、パンチ４
２の筒状部４１の下端面の環状テーパー面４６の傾斜角
の大きさを適切に設定することによって、段付き部品１
の第１小径部２と第２小径部３との長さ寸法を自由に設
定して鍛造成形することができる。Here, if it is desired that the axial length of the second small diameter portion 3 of the stepped component 1 is longer than the axial length of the first small diameter portion 2, the taper of the forming hole 21 of the die 22 is required. The magnitude of the inclination angle of the annular tapered surface 46 at the lower end surface of the cylindrical portion 41 of the punch 42 may be larger than the magnitude of the inclination angle of the hole 28. Incidentally, these inclination angles are set to the first values through experiments and the like.
It is desirable to set appropriately in relation to the length of the second small diameter portions 2 and 3. Thus, the size of the inclination angle of the tapered hole 28 of the molding hole 21 of the die 22 and the size of the punch 4
By appropriately setting the inclination angle of the annular tapered surface 46 at the lower end surface of the second cylindrical portion 41, the stepped component 1
The length of the first small-diameter portion 2 and the second small-diameter portion 3 can be freely set for forging.
【００２０】以上のように、段付き部品１を鍛造成形
後、上型４０を上昇させ、この段付き部品１を下型２０
からエジェクトして取り出す。その後、切削加工ステー
ションにおいて、段付き部品１の大径部４の外周部に歯
形部を形成したり、外周面を切削したりして、自動車の
ミッションのアウトプットギヤ等として使用される段付
き部品の完成品が得られる。As described above, after forging the stepped part 1, the upper die 40 is raised, and the stepped part 1 is moved to the lower die 20.
Eject from and take out. Then, at a cutting station, a stepped portion used as an output gear of a transmission of an automobile or the like is formed by forming a toothed portion on the outer peripheral portion of the large diameter portion 4 of the stepped component 1 or cutting the outer peripheral surface. The finished part is obtained.
【００２１】以上説明した段付き部品の鍛造金型及び段
付き部品の鍛造方法によれば、軸方向中段部の大径部４
と、軸方向下段部の第１小径部２と、軸方向上段部の第
２小径部３とを同時に鍛造成形することができ、段付き
部品１の鍛造成形を１工程で行うことができるので、工
程数を半減させて、加工コストを低減することができ
る。しかも、パンチ４２の筒状部４１の下端面の環状テ
ーパー面４６と、ダイ２２の成形用穴２１のテーパー穴
２８によって、鍛造成形時における鍛造素材８の流動が
促進されるので、鍛造成形時の鍛造加工力を低減できる
とともに、金型１１と鍛造素材８との焼付きを防止で
き、金型寿命を向上することができる。According to the forging die for stepped parts and the method for forging stepped parts described above, the large-diameter portion 4 in the axially middle portion is provided.
And the first small-diameter portion 2 at the lower part in the axial direction and the second small-diameter part 3 at the upper part in the axial direction can be forged at the same time, and the forging of the stepped part 1 can be performed in one step. In addition, the number of steps can be halved and the processing cost can be reduced. In addition, the annular tapered surface 46 at the lower end surface of the cylindrical portion 41 of the punch 42 and the tapered hole 28 of the forming hole 21 of the die 22 facilitate the flow of the forging material 8 at the time of forging. Can be reduced, the seizure between the mold 11 and the forging material 8 can be prevented, and the life of the mold can be improved.
【００２２】更に、ダイ２２の成形用穴のテーパー穴２
８の傾斜角の大きさと、パンチ４２の筒状部４１の下端
面の環状テーパー面４６の傾斜角の大きさを予め適切に
設定することによって、段付き部品１の第１小径部２と
第２小径部３の軸方向の長さを自由に設定することがで
きる。尚、上記実施例においては、軸心部に貫通孔７が
形成される筒状の段付き部品１の鍛造金型及び段付き部
品の鍛造方法について説明したが、本発明はこれに限ら
ず、例えば、前記マンドレル２４の小径部３３がないも
のを使用することによって、中実状の段付き部品が得ら
れる鍛造金型及び鍛造方法にも適用できるものである。Further, the tapered hole 2 of the molding hole of the die 22 is formed.
8 and the inclination angle of the annular tapered surface 46 at the lower end surface of the cylindrical portion 41 of the punch 42 are appropriately set in advance, so that the first small-diameter portion 2 of the stepped component 1 and the first small-diameter portion 2 The length of the small diameter portion 3 in the axial direction can be freely set. In the above embodiment, the forging die for the cylindrical stepped part 1 having the through hole 7 formed in the shaft center and the method for forging the stepped part have been described, but the present invention is not limited to this. For example, by using the mandrel 24 having no small-diameter portion 33, the present invention can be applied to a forging die and a forging method capable of obtaining a solid stepped part.
【図１】実施例に係る鍛造装置の上型と下型と鍛造素材
の縦断面図である。FIG. 1 is a longitudinal sectional view of an upper die, a lower die and a forging material of a forging device according to an embodiment.
【図２】図１の鍛造装置の上型と下型とで段付き部品を
成形した状態を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a state in which a stepped component is formed by an upper die and a lower die of the forging device of FIG. 1;
【図３】図１の鍛造装置上型と下型とで成形される段付
き部品の縦断面図である。FIG. 3 is a longitudinal sectional view of a stepped part formed by an upper die and a lower die of the forging apparatus of FIG. 1;
【図４】従来技術に係る鍛造素材の縦断面図である。FIG. 4 is a longitudinal sectional view of a forging material according to the related art.
【図５】従来の鍛造方法の第１工程で鍛造成形された鍛
造成形品の縦断面図である。FIG. 5 is a longitudinal sectional view of a forged product formed by forging in a first step of a conventional forging method.
【図６】従来の鍛造方法の第２工程で鍛造成形された鍛
造成形品の縦断面図である。FIG. 6 is a longitudinal sectional view of a forged product formed by forging in a second step of a conventional forging method.
１ 段付き部品 ２ 第１小径部 ３ 第２小径部 ４ 大径部 ８ 鍛造素材 １１ 鍛造金型 ２０ 下型 ２２ ダイ ２７ 第１小径穴 ２８ テーパー穴 ２９ 大径穴 ４０ 上型 ４１ 筒状部 ４２ パンチ ４５ 第２小径穴 ４６ 環状のテーパ面 DESCRIPTION OF SYMBOLS 1 Stepped component 2 1st small diameter part 3 2nd small diameter part 4 Large diameter part 8 Forging material 11 Forging die 20 Lower die 22 Die 27 First small diameter hole 28 Taper hole 29 Large diameter hole 40 Upper die 41 Cylindrical part 42 Punch 45 Second small diameter hole 46 Annular tapered surface
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２１Ｋ 1/30 Ｂ２１Ｋ 1/30 Ａ (72)発明者 富田 美喜雄 広島県東広島市八本松町飯田1844 株式 会社音戸工作所 八本松工場内 (72)発明者 伊藤 一也 広島県東広島市八本松町飯田1844 株式 会社音戸工作所 八本松工場内 (56)参考文献 実開 昭63−145534（ＪＰ，Ｕ) 実開 平４−26638（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) B21K 1/00 - 31/00 B21J 1/00 - 13/14,17/00 - 19/04──────────────────────────────────────────────────続 き Continuing on the front page (51) Int.Cl. 6 Identification code FI B21K 1/30 B21K 1/30 A (72) Inventor Mikio Tomita 1844, Hidamatsumatsucho Iida, Higashihiroshima-shi, Hiroshima Oto Co., Ltd. Yamotomatsu Plant (72) Inventor Kazuya Ito 1844, Iida, Hachihonmatsu-cho, Higashihiroshima-shi, Hiroshima Pref. Inside the Oto Machinery Works, Hachihonmatsu Plant (56) References Open-ended 1988-145534 (JP, U) Opened 4-26638 (JP) , U) (58) Fields investigated (Int. Cl. 6 , DB name) B21K 1/00-31/00 B21J 1/00-13/14, 17/00-19/04
Claims (3)
１小径部、大径部、第２小径部を有する軸状又は筒状の
段付き部品を鍛造成形する為の鍛造金型であって、 前記鍛造金型の下型ダイは、第１小径部を成形する為の
第１小径穴と、この第１小径穴の上端に連なり、上方へ
向かって大径化するように傾斜した環状のテーパー穴
と、このテーパー穴の上端に連なり大径部を成形する為
の大径穴とを備え、 前記鍛造金型の上型パンチは、第２小径部を成形する為
の第２小径穴を有するとともに、前記大径穴に摺接状に
内嵌される筒状に形成され、その下端部には、上方に向
かって小径化するように傾斜した環状のテーパー面が形
成された、 ことを特徴とする段付き部品の鍛造金型。1. A forging die for forging an axial or cylindrical stepped part having a first small diameter part, a large diameter part, and a second small diameter part in a lower part, a middle part, and an upper part in an axial direction, respectively. The lower die of the forging die has a first small-diameter hole for forming a first small-diameter portion, and is connected to an upper end of the first small-diameter hole, and is inclined so as to increase in diameter upward. An annular tapered hole, and a large-diameter hole connected to the upper end of the tapered hole to form a large-diameter portion. The upper die punch of the forging die includes a second die for forming a second small-diameter portion. It has a small-diameter hole, and is formed in a cylindrical shape that is fitted into the large-diameter hole in a sliding contact manner, and has a lower end formed with an annular tapered surface that is inclined so as to decrease in diameter upward. A forging die for stepped parts, characterized in that:
１小径部、大径部、第２小径部を有する軸状又は筒状の
段付き部品を１工程で鍛造成形する方法であって、 前記第１小径部を成形する為の第１小径穴と、この第１
小径穴の上端に連なり、上方へ向かって大径化するよう
に傾斜した環状のテーパー穴と、このテーパー穴の上端
に連なり大径部を成形する為の大径穴とを備えた下型ダ
イと、 前記第２小径部を成形する為の第２小径穴を有するとと
もに、前記大径穴に摺接状に内嵌される筒状に形成さ
れ、下端部には上方に向かって小径化するように傾斜し
た環状のテーパー面が形成された上型パンチとを用い、 前記下型ダイのテーパー穴の傾斜を介して第１小径穴へ
の鍛造素材の流動を促進するとともに、上型パンチのテ
ーパー面を介して第２小径穴への鍛造素材の流動を促進
することを特徴とする段付き部品の鍛造方法。2. A method in which a shaft-shaped or cylindrical stepped part having a first small-diameter portion, a large-diameter portion, and a second small-diameter portion in an axial lower portion, a middle portion, and an upper portion, respectively, is forged in a single step. A first small-diameter hole for forming the first small-diameter portion;
A lower die having an annular tapered hole connected to the upper end of the small-diameter hole and inclined so as to increase in diameter upward, and a large-diameter hole connected to the upper end of the tapered hole to form a large-diameter portion. And a second small-diameter hole for molding the second small-diameter portion, and is formed in a cylindrical shape that is fitted in the large-diameter hole in a sliding contact manner, and has a lower end that is reduced in diameter upward. And an upper die punch having an annular tapered surface that is inclined as described above, while promoting the flow of the forging material to the first small-diameter hole through the inclination of the taper hole of the lower die. A method of forging a stepped part, comprising: promoting a flow of a forged material into a second small-diameter hole through a tapered surface.
さよりも大きいときには、前記テーパー穴の傾斜角を前
記テーパー面の傾斜角よりも大きく設定することを特徴
とする請求項２に記載の段付き部品の鍛造方法。3. When the length of the first small diameter portion is larger than the length of the second small diameter portion, the inclination angle of the tapered hole is set to be larger than the inclination angle of the tapered surface. 3. The method for forging a stepped part according to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5316005A JP2847024B2 (en) | 1993-11-22 | 1993-11-22 | Forging die for stepped parts and method for forging stepped parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5316005A JP2847024B2 (en) | 1993-11-22 | 1993-11-22 | Forging die for stepped parts and method for forging stepped parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07144247A JPH07144247A (en) | 1995-06-06 |
| JP2847024B2 true JP2847024B2 (en) | 1999-01-13 |
Family
ID=18072187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5316005A Expired - Fee Related JP2847024B2 (en) | 1993-11-22 | 1993-11-22 | Forging die for stepped parts and method for forging stepped parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2847024B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4722324B2 (en) * | 2001-05-21 | 2011-07-13 | 株式会社久保田鉄工所 | Manufacturing method of hollow stepped shaft |
| JP4328847B2 (en) | 2003-11-25 | 2009-09-09 | 株式会社デンソー | Method for manufacturing cylindrical member |
| JP4880563B2 (en) * | 2007-10-16 | 2012-02-22 | 日本特殊陶業株式会社 | Manufacturing method of metal shell for spark plug |
| CN103056261B (en) * | 2012-12-31 | 2015-08-19 | 重庆水轮机厂有限责任公司 | Light rail simply supported beam shearing resistance tenon die forging method |
| CN103624201B (en) * | 2013-11-11 | 2016-08-10 | 梧州恒声电子科技有限公司 | High line diameter ratio T iron head combination die |
-
1993
- 1993-11-22 JP JP5316005A patent/JP2847024B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07144247A (en) | 1995-06-06 |
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